| Journal: | Revista mexicana de física |
| Database: | PERIÓDICA |
| System number: | 000378376 |
| ISSN: | 0035-001X |
| Authors: | García Gudiño, D1 Toledo Sánchez, G1 |
| Institutions: | 1Universidad Nacional Autónoma de México, Instituto de Física, México, Distrito Federal. México |
| Year: | 2014 |
| Season: | Mar-Abr |
| Volumen: | 60 |
| Number: | 2 |
| Pages: | 123-128 |
| Country: | México |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, teórico |
| English abstract | The usual procedure to extract the geƒƒωpπ effective coupling from experimental data resumes not only the ρ meson effect but also all its additional radial excitation modes. In this work, we consider a particular form of the spectrum and relations among the couplings to explicitly add the radial excitations of the ρ meson from the ω → π0γ and ω → 3π decays. This allows to identify the single gωρπ = 8.3 ± 0.8 GeV-1, which is about 40% smaller than the effective geƒƒωpπ. We verify the consistency with the chiral approach in the π0 → γγ and γ* → 3π processes, exhibiting the role of each contribution. In particular, we show that for the γ* → 3π decay, the usual relation AVMDγ3π= (3/2)AWZWγ3π, encodes all the vector contributions and not only the ρ meson one. In addition, we find that there is a strong (accidental) cancelation between the radial excitations and the contact term contributions |
| Disciplines: | Física y astronomía |
| Keyword: | Física de partículas y campos cuánticos, Decaimientos fuertes, Mesones vectoriales, Acoplamientos eficaces |
| Keyword: | Physics and astronomy, Particle physics and quantum fields, Strong decays, Vector mesons, Effective couplings |
| Full text: | Texto completo (Ver PDF) |
